AT32UC3L064-AUTES ATMEL [ATMEL Corporation], AT32UC3L064-AUTES Datasheet - Page 47

• Manufacturer Part Number: AT32UC3L064-AUTES
• Manufacturer: ATMEL [ATMEL Corporation]

7.7.1.2
Table 7-12.
Notes:
7.7.2
Table 7-13.
32099DS–06/2010
Symbol
1/(t
C
C
t
Symbol
1/(t
t
STARTUP
ST
C
L
i
L
CPMAIN
CP32KHz
1. Please refer to the SCIF chapter for details.
2. Nominal crystal cycles.
)
32KHz Crystal Oscillator (OSC32K) Characteristics
)
Crystal Oscillator Characteristics
Crystal Oscillator Characteristics
32 KHz Crystal Oscillator Characteristics
Parameter
Crystal oscillator frequency
Crystal load capacitance
Internal equivalent load capacitance
Startup time
Parameter
Crystal oscillator frequency
Startup time
Crystal load capacitance
The following table describes the characteristics for the oscillator when a crystal is connected
between XIN and XOUT as shown in
where the crystal load capacitance
can be found in the crystal datasheet. The capacitance of the external capacitors (C
then be computed as follows:
where C
Figure 7-3.
Figure 7-3
must choose a crystal oscillator where the crystal load capacitance
in the table. The exact value of
UC3L
PCB
C
and the equation above also applies to the 32 KHz oscillator connection. The user
i
is the capacitance of the PCB.
Oscillator Connection
Conditions
R
S
= 60kOhm, C
XOUT
XIN
Conditions
SCIF.OSCCTRL.GAIN = 2
C
L
can then be found in the crystal datasheet.
C
C
L
L
= 9pF
LEXT
is within the range given in the table. The exact value of C
Figure
=
2 C
(
C
7-3. The user must choose a crystal oscillator
L
L
–
C
(1)
i
) C
–
PCB
AT32UC3L016/32/64
Min
Min
3
6
6
C
C
30 000
LEXT
30 000
LEXT
32 768
C
Typ
Typ
L
2
is within the range given
(2)
(1)
Max
Max
12.5
16
18
LEXT
cycles
MHz
cycles
Unit
Unit
pF
pF
Hz
pF
) can
47
L